The Weight of the Black Water

**April 5, 2026 — 03:15 (Chamber Time)**

You forget what a straight line looks like. In the saturation system, everything is curved. The steel walls of the living chamber, the hatch of the transfer lock, the diving bell that drops us down into the dark. We are four men living in a pressurized tube the size of a transit van, sitting on the deck of a ship tossing in the North Sea, but our bodies are chemically tricked into believing we are two hundred meters underwater.

It’s been eighteen days since I last felt the wind. Eighteen days of breathing heliox.

I was writing a letter to my daughter earlier. She turned seven yesterday back in Aberdeen. I tried to call her on the comms line, but the helium in our breathing mix distorts our vocal cords so badly that we all sound like cartoon ducks. We use voice unscramblers to talk to topside control, but the software always makes you sound like a tinny, synthesized robot. I sang her happy birthday like that—a robot duck trapped in a submarine. She laughed, but it’s a terrifying sound when you really think about it. It’s the sound of not being entirely human anymore.

Down in the water, it’s a different kind of alien.

During my shift today, we were repairing a flange on a wellhead. Two hundred meters down, there is no sunlight. None. The water is a thick, freezing blackness that swallows the floodlights from the ROV after about ten feet. You are working in a tiny halo of artificial light, wrestling with hydraulic wrenches, while millions of tons of ocean press in on you from every possible direction. Your only lifeline to existence is the thick yellow umbilical cord supplying your breathing gas and hot water to your suit. If the hot water fails, you freeze to death in minutes. If the gas fails... well, you don't think about that. You just keep your eyes on the weld.

Topside pays us a small fortune for this. "Danger pay," the recruits call it. But the danger isn't explosive; it's slow. It's the ache in your joints when the pressure shifts. It's the bone-deep exhaustion of your body constantly fighting a helium-rich environment that strips away your body heat. It's the knowledge that if something goes wrong on the ship and it sinks, we are locked in this pressurized tube. We can't just open the hatch. We would decompress instantly. Our blood would boil.

Ten more days of this rotation, then a week of slow, agonizing decompression before we can step out onto the deck and breathe normal, heavy air.

My bunkmate, Lars, is staring at the ceiling, listening to a podcast about gardening. He wants to plant tomatoes when he gets back to Bergen. It is the most absurd, beautiful thing I can imagine right now—putting your hands in soft, uncompressed soil, under a bright, open sky.

I’m going to try to sleep. The constant hum of the gas scrubbers is giving me a headache, and tomorrow I have another six hours in the black.